Bug 2563716 (CVE-2026-115943)

Summary: CVE-2026-115943 perl-spreadsheet-xlsx: Spreadsheet::XLSX: Arbitrary code execution via crafted number format conditions
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in Spreadsheet::XLSX. This vulnerability can lead to arbitrary code execution when the library processes a spreadsheet containing crafted number format conditions. The module improperly evaluates workbook-supplied formatting conditions as code during file parsing. An attacker can exploit this flaw by providing a malicious spreadsheet file, potentially executing arbitrary commands with the privileges of the application processing the file.
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Bug Depends On: 2565569, 2565570, 2565571, 2565572, 2565573, 2565574    
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Description OSIDB Bzimport 2026-10-29 22:11:32 UTC 
Spreadsheet::XLSX versions before 0.19 for Perl allow code execution via string eval of number format conditions in ExcelFmt.

When a number format has a condition such as [>100], ExcelFmt chooses the format section by passing the condition and the cell value to a string eval. Both come from the workbook, and the eval runs while Spreadsheet::XLSX->new parses it.

An attacker who supplies an XLSX file can run arbitrary Perl code.